Mvied notes: I’d just like to point out that the is_home() function is true if you’re on the main blog page, and the is_front_page() function can be the same page unless you have a static front page set, then it will only be true on that page.

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Passing variables in the URL, byÂ stvwlf from http://wordpress.org/support/topic/passing-variables-using-the-permalink-structure :

Find and show related posts by tag: http://wordpress.org/support/topic/variables-through-get_posts-query_posts

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elseloop offers a simple way to implement a “Post template based on category”: http://wordpress.org/support/topic/post-template-based-on-category-or-tag

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I just want to pass my thanks to the many talented people who take the time to share their expertise on the WordPress community forum. They are adding value to the world, so, KUDOS to all you geniuses!